Audiopipe 133 UF Bass Blockers 300Hz - 4 Ohm 150Hz - 8 Ohm 6"x9" 6"x8" 5"x7"

Excellent bass blockers if they are in spec with your speakers. Work great on my 6x9 woofers.

Great at blocking low frequencies that can damage small speakers like 3.5” speakers. Requires a little bit of soldering but worth the effort.

Used them on some 6 3/4 speakers. When I got them it said was for 6x9 but worked on my speakers. Came in quickly also.

They work good . Speakers wear popping when u turned up volume. Not no more they sound way better clean sound.

The wire broke right at the capacitor. No flexibility.

It's refreshing to find a product that does exactly what it claims . Installed these in my f150 reg cab truck . Not only did they improve sound stage by placing the bass now in the rear of the stage where it belongs but also freed up power being robbed by low frequencies where i didn't want it . Thanks 👍

I install in my front doors and resolve problem (pop up sound)

Very easy to install and save my door speakers from all the low bass frequencies. I returned them for 200hz to allow the door speakers to get a little lower. These totally do what they say.